Weft inserting nozzle



Feb. 6, 1968 T. FRANSEN I 3,367,373

WEFT INSERTING NOZZLE Filed Feb. 16; 1966 2 Sheets-Sheet 1 T. FRANSEN Feb. 6, 1968 WEFT INSERTING NO Z ZLEE 2 Sheets-Sheet Filed Feb. 16, 1966 a 3,367,373 t nted eb-a 6,..19

1 3,367,373. 1 WEFTINSERTING NOZZLE Theodorus Fransen, Deurne, North-Brabant, Netherlands,

assignorto N. V.1Machinefabriek L. te Strake, Deurne, North-Brabant, Netherlands, 'a Dutch company. FiledFeb. 16, 1966,.Ser.'No. 527,701

Claims priority, application NetherlandspEeb. 19,1965,

. 65 2458 a 6 Claims. or. 139-127 MAABSTRAACT OF THE DISCLOSURE A Wee inserting device for introducing a weftjinto, the shed of a loom by means of a fluid under pressure,

According to the invention a-shielding-tube can .'be provided also and this. is attained in that rthewdouble -,walled tube is surrounded by an-additional tube also provided with a slot; said additional tube .beingplaced radially from-thedouble walled tubew 1'; In a practical .embodimentflthe additional=tube extends beyond the delivery. end of the 'doubleswalledtube,

wherein the improvement comprises a double-walled tube,

having a longitudinal slot, the double walls of the tube being connected by radial walls forming'the sides of the slot,' .and.the tube havingan inlet end provided with an inlet opening into the space between the double walls for admitting a fluid under pressure, and having an outlet end provided with an outlet-opening," for'discharging fluid from the space between the double walls, which is annular and is 'interrupted'b'y the slot, the central passage of the tube adapted to conduct a flow of secondary air induced by the stream of fluid issuing from the annular opening, to carry a weft thread into such stream of fluid.

Background of the invention The invention relates to improvements in or relating to a weft inserting device to be used in shuttleless looms, in which a weft is blown into the shed by means of a fluid under pressure. Such a weft inserting device heretofore known comprised a jet nipple and injector means cooperating with said jet nipple and having a longitudinal slot as described in U.S. Patent No. 2,925,833. In this known weft inserting device an injector tube is situated around a single jet nozzle, which injector tube is provided with a longitudinal slot to facilitate passage of a remaining part of the weft, which is to be blown into the shed of a loom.

Summary of the invention The object of this invention is to provide a weft inserting device in which a strong suction action for supplying secondary air can be created without direct striking of the thread by a violent jet of the fluid when the thread at the start of the weft inserting operation still has a low running speed and in which a suction opening in the injector tube can be very large for receiving the thread and the secondary air.

According to the invention this is attained by providing a mantle which is generally in the form of a tube that is provided with a slot and is double walled. The walls of said double walled tube enclose an internal space between them, which space is closed in at the sides of said slot and the walls at the delivery end of said tube form an annular discharge opening which is interrupted at said slot.

A practical embodiment according to the invention is attained in that the double walled tube at the end opposite to the annular discharge opening merges into a part, which is offset laterally of the axis of said tube.

Preferably the part of the double walled tube which is substantially offset laterally of the axis of said tube gradually merges into a flattened part to the interior of which a line for air under pressure is connected. The invention provides an annular fluid discharging device surrounding a central passage for the thread.

whereas the slot in this double walled'tube-and theuslot in the additional tube are situated in a common plane through the common axis of said ,tubes.':? J T:

Brief description of the drawing 1 The invention will be deScribedJby, meansrof anaembodiment with reference to the accompanying drawing,

in which: a FIG. 11 is .a vertical. section throughaa weft-inserting device according to the invention, whichweft inserting device is to be used in connection with a.loom.. -FIG. 2 isa perspective viewof; the doublewalledtube wef t inserting deviceaccording to theinventionun Description of thepreferred embodiment Laterally of the frame of a loom a'we'ft inser tin g de- .vice is mounted on stationary part 1 of the loom.

The weft inserting device consists of a tube 2 having a double wall consisting of the concentrically arranged inner wall 3 and outer wall 4. A space is present between the inner wall 3 and the outer wall 4. This space is connected to a supply line 5 for air under pressure. The tube 2 is provided with a slot 6 extending longitudinally of the tube 2.

The purpose of this slot is to free the weft from the device as described in US. Patent No. 2,925,833. The walls 3 and 4 are connected at this slot by walls 7 and 8 extending in a radial direction. At the end of the tube 2 there is an annular outlet or discharge opening 9 between the walls 3 and 4. This annular discharge opening is interrupted at the slot 6 as is clearly shown in FIG. 2. In order to create a strong air jet, air under pressure from a line 5, which is connected to a source of compressed air, can flow into the space between the walls 3 and 4 and can flow out of the annular discharge opening 9. The tube 2 merges into a part, which is substantially offset laterally of the axis of the tube 2 at the end opposite to the annular discharge opening 9. By this construction a relatively large opening has been obtained for sucking in a thread, which opening is generally indicated by the reference numeral 10. The part, which is offset laterally of the axis of the tube 2 is flattened at its end. The walls 7 and 8 extend also into this part. An inlet in the form of a rectangular opening 11 is present at the end, which opening is connected to a line 5. This opening is indicated by a dotted line in FIG. 2.

It is possible to provide an additional shielding tube around the tube 2, for confining and directing the blast of air issuing from the annular discharge opening 9. This shielding tube is indicated by 12 in FIG. 1. The mantle of the shielding tube 12, however, is single-walled and this wall 13 is indicated in the longitudinal section in FIG. 1. The shielding tube possesses also a slot for releasing the weft and the side edge of this slot is visible. The slot in the shielding tube 12 is positioned above the slot in the tube 2 as appears from FIG. 1. Both slots are thus arranged in a common vertical plane running through the axis of the tube 2. Both the tube 2 and the shielding tube 12 are symmetrical about this plane. The shielding tube 12 is of generally the same shape as the tube 2, although larger in size, and therefore possesses also an opening, which is similar to the opening 10. The

opening in the shielding tube is generally indicated by -l5.'As described above a minimum consumption of air and a large suction opening for the secondary air and thereby also for the thread can be obtained, whereas still a good catching of the thread in the air jet can be obtained. By the provision of the slot 6 in the tube 2 the thread can be freed. The thread is drawn from a thread package 16 indicated in FIG. 3 by means of conical rollers 17 and 18 situated within the housing of the loom. Further the thread 19 runs from the rollers 17,

. 18 to a thread presenting device 20 and then to the opening 10 of the tube 2.

I claim:

1. A weft inserting device for introducing a weft into a shed of a loom by means of a fluid under pressure, wherein the improvement comprises a substantially annular double-walled tube having a longitudinal slot, the double walls of the tube being connected by radial walls forming the sides of the slot and defining a space therebetween, the tube being provided at one end with an inlet opening into the space between the double walls for admitting a stream of fluid under pressure therein, and an annular outlet at its other end for discharging fluid from the space between the double walls, the outlet being interrupted by the slot, the central portion of the tube being adapted to conduct a flow of secondary air induced by the stream of fluid issuing from the annular opening, to carry a weft thread into such stream of fluid.

2. A weft inserting device according to claim 1 wherein at the inlet end of the tube the slot flares so that the double-walled tube merges into a double-walled part which is offset laterally from the axis of the tube.

3. A weft inserting device according to claim 2 wherein the laterally offset part of the double-walled tube merges into a flat double-walled portion at the inlet end of the tube.

4. A weft inserting device according to claim 1 wherein a slotted co-axial shielding tube is disposed around the double-walled tube and is radially spaced therefrom.

5. A weft inserting device according to claim 4 wherein the shielding tube extends longitudinally beyond the outlet end of the double-walled tube.

6. A weft inserting device according to claim 4 wherein the slot of the double-walled tube and the slot of the shielding tube are situated in a common plane running through the common axis of the tubes.

References Cited UNITED STATES PATENTS 2,925,833 2/1960 Te Strake 139127 FOREIGN PATENTS 583,830 10/1958 Italy.

HENRY S. JAUDON, Primary Examiner. 

